[orx-filters] Set shader parameter to null in Filter constructors

orx-jumpflood/src/commonMain/kotlin/ClusteredField.kt

@@ -17,7 +17,7 @@ import kotlin.math.pow
 
 @Description("Clustered field")
 class ClusteredField(decodeMode: DecodeMode = DecodeMode.DIRECTION,
-                     private val outputDistanceToContours: Boolean = true) : Filter1to1() {
+                     private val outputDistanceToContours: Boolean = true) : Filter1to1(null) {
     @DoubleParameter("threshold", 0.0, 1.0)
     var threshold = 0.5
 

orx-jumpflood/src/commonMain/kotlin/DirectionalField.kt

@@ -48,7 +48,7 @@ import kotlin.math.pow
  *
  */
 @Description("Directional field")
-class DirectionalField : Filter1to1() {
+class DirectionalField : Filter1to1(null) {
     @DoubleParameter("threshold", 0.0, 1.0)
     var threshold = 0.5
 

orx-jumpflood/src/commonMain/kotlin/DistanceField.kt

@@ -34,7 +34,7 @@ import kotlin.math.pow
  * intermediate buffers to reduce memory allocation overhead.
  */
 @Description("Distance field")
-class DistanceField : Filter1to1() {
+class DistanceField : Filter1to1(null) {
     @DoubleParameter("threshold", 0.0, 1.0)
     var threshold = 0.5
 

orx-jumpflood/src/commonMain/kotlin/fx/InnerBevel.kt

@@ -25,7 +25,7 @@ private class InnerBevelFilter : Filter(filterShaderFromCode(jf_inner_bevel, "in
 }
 
 @Description("Inner bevel")
-class InnerBevel : Filter1to1() {
+class InnerBevel : Filter1to1(null) {
     @DoubleParameter("threshold", 0.0, 1.0)
     var threshold = 0.01
 

orx-jumpflood/src/commonMain/kotlin/fx/InnerGlow.kt

@@ -34,7 +34,7 @@ private class InnerGlowFilter : Filter(filterShaderFromCode(jf_inner_glow, "inne
 }
 
 @Description("Inner glow")
-class InnerGlow : Filter1to1() {
+class InnerGlow : Filter1to1(null) {
     @DoubleParameter("width", 0.0, 50.0)
     var width = 5.0
 

orx-jumpflood/src/commonMain/kotlin/fx/Inpaint.kt

@@ -30,7 +30,7 @@ private class InpaintFilter : Filter(filterShaderFromCode(jf_inpaint, "inpaint")
 }
 
 @Description("Inpaint")
-class Inpaint : Filter1to1() {
+class Inpaint : Filter1to1(null) {
     @DoubleParameter("width", 0.0, 1.0)
     var width = 0.5
 

orx-jumpflood/src/commonMain/kotlin/fx/OuterGlow.kt

@@ -34,7 +34,7 @@ private class OuterGlowFilter : Filter(filterShaderFromCode(jf_outer_glow, "oute
 }
 
 @Description("Outer glow")
-class OuterGlow : Filter1to1() {
+class OuterGlow : Filter1to1(null) {
     @DoubleParameter("width", 0.0, 50.0)
     var width = 5.0
 

orx-jumpflood/src/commonMain/kotlin/fx/Skeleton.kt

@@ -28,7 +28,7 @@ private class SkeletonFilter : Filter(filterShaderFromCode(jf_skeleton, "skeleto
 }
 
 @Description("Skeleton")
-class Skeleton : Filter() {
+class Skeleton : Filter(null) {
     @DoubleParameter("threshold", 0.0, 1.0, order = 0)
     var threshold = 0.5
 

orx-jumpflood/src/commonMain/kotlin/fx/StraightSkeleton.kt

@@ -31,7 +31,7 @@ private class StraightSkeletonFilter : Filter(filterShaderFromCode(jf_straight_s
 }
 
 @Description("Skeleton")
-class StraightSkeleton : Filter() {
+class StraightSkeleton : Filter(null) {
     @DoubleParameter("threshold", 0.0, 1.0, order = 0)
     var threshold = 0.5